No, colds do not come from the cold air. The reason there are more upper respiratory infections in the fall/winter is because most people's homes are all closed up tight, letting no fresh air in the house, thus virus' stay around longer in the warm house environment.
I live in the Buffalo area, and I'm very used to the cold weather. If I leave the house for several hours, I turn my thermostat down and crack the kitchen window an inch or so, just to let in some fresh air.
Colds are caused by viruses, but one may be more susceptable to catching a cold if one is gets too chilled from being outside without a coat for instance, thus your immune system cannot fight off the cold virus as easily as it would if you didn't get that chill.
At least that's what I've read and come to believe. My family is much healthier since I've let some air exchange in the house several times a week during the winter.
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